385 lines
14 KiB
C++
385 lines
14 KiB
C++
/*
|
|
*******************************************************************************
|
|
* Copyright (C) 2008-2011, International Business Machines Corporation and
|
|
* others. All Rights Reserved.
|
|
*******************************************************************************
|
|
*
|
|
*
|
|
* File PLURRULE.H
|
|
*
|
|
* Modification History:*
|
|
* Date Name Description
|
|
*
|
|
********************************************************************************
|
|
*/
|
|
|
|
#ifndef PLURRULE
|
|
#define PLURRULE
|
|
|
|
#include "unicode/utypes.h"
|
|
|
|
/**
|
|
* \file
|
|
* \brief C++ API: PluralRules object
|
|
*/
|
|
|
|
#if !UCONFIG_NO_FORMATTING
|
|
|
|
#include "unicode/format.h"
|
|
|
|
#ifndef U_HIDE_DRAFT_API
|
|
/**
|
|
* Value returned by PluralRules::getUniqueKeywordValue() when there is no
|
|
* unique value to return.
|
|
* @draft ICU 4.8
|
|
*/
|
|
#define UPLRULES_NO_UNIQUE_VALUE ((double)-0.00123456777)
|
|
#endif /* U_HIDE_DRAFT_API */
|
|
|
|
U_NAMESPACE_BEGIN
|
|
|
|
class Hashtable;
|
|
class RuleChain;
|
|
class RuleParser;
|
|
class PluralKeywordEnumeration;
|
|
|
|
/**
|
|
* Defines rules for mapping non-negative numeric values onto a small set of
|
|
* keywords. Rules are constructed from a text description, consisting
|
|
* of a series of keywords and conditions. The {@link #select} method
|
|
* examines each condition in order and returns the keyword for the
|
|
* first condition that matches the number. If none match,
|
|
* default rule(other) is returned.
|
|
*
|
|
* For more information, details, and tips for writing rules, see the
|
|
* LDML spec, C.11 Language Plural Rules:
|
|
* http://www.unicode.org/draft/reports/tr35/tr35.html#Language_Plural_Rules
|
|
*
|
|
* Examples:<pre>
|
|
* "one: n is 1; few: n in 2..4"</pre>
|
|
* This defines two rules, for 'one' and 'few'. The condition for
|
|
* 'one' is "n is 1" which means that the number must be equal to
|
|
* 1 for this condition to pass. The condition for 'few' is
|
|
* "n in 2..4" which means that the number must be between 2 and
|
|
* 4 inclusive for this condition to pass. All other numbers
|
|
* are assigned the keyword "other" by the default rule.
|
|
* </p><pre>
|
|
* "zero: n is 0; one: n is 1; zero: n mod 100 in 1..19"</pre>
|
|
* This illustrates that the same keyword can be defined multiple times.
|
|
* Each rule is examined in order, and the first keyword whose condition
|
|
* passes is the one returned. Also notes that a modulus is applied
|
|
* to n in the last rule. Thus its condition holds for 119, 219, 319...
|
|
* </p><pre>
|
|
* "one: n is 1; few: n mod 10 in 2..4 and n mod 100 not in 12..14"</pre>
|
|
* This illustrates conjunction and negation. The condition for 'few'
|
|
* has two parts, both of which must be met: "n mod 10 in 2..4" and
|
|
* "n mod 100 not in 12..14". The first part applies a modulus to n
|
|
* before the test as in the previous example. The second part applies
|
|
* a different modulus and also uses negation, thus it matches all
|
|
* numbers _not_ in 12, 13, 14, 112, 113, 114, 212, 213, 214...
|
|
* </p>
|
|
* <p>
|
|
* Syntax:<pre>
|
|
* \code
|
|
* rules = rule (';' rule)*
|
|
* rule = keyword ':' condition
|
|
* keyword = <identifier>
|
|
* condition = and_condition ('or' and_condition)*
|
|
* and_condition = relation ('and' relation)*
|
|
* relation = is_relation | in_relation | within_relation | 'n' <EOL>
|
|
* is_relation = expr 'is' ('not')? value
|
|
* in_relation = expr ('not')? 'in' range_list
|
|
* within_relation = expr ('not')? 'within' range
|
|
* expr = 'n' ('mod' value)?
|
|
* range_list = (range | value) (',' range_list)*
|
|
* value = digit+
|
|
* digit = 0|1|2|3|4|5|6|7|8|9
|
|
* range = value'..'value
|
|
* \endcode
|
|
* </pre></p>
|
|
* <p>
|
|
* An "identifier" is a sequence of characters that do not have the
|
|
* Unicode Pattern_Syntax or Pattern_White_Space properties.
|
|
* <p>
|
|
* The difference between 'in' and 'within' is that 'in' only includes
|
|
* integers in the specified range, while 'within' includes all values.</p>
|
|
* <p>
|
|
* Keywords
|
|
* could be defined by users or from ICU locale data. There are 6
|
|
* predefined values in ICU - 'zero', 'one', 'two', 'few', 'many' and
|
|
* 'other'. Callers need to check the value of keyword returned by
|
|
* {@link #select} method.
|
|
* </p>
|
|
*
|
|
* Examples:<pre>
|
|
* UnicodeString keyword = pl->select(number);
|
|
* if (keyword== UnicodeString("one") {
|
|
* ...
|
|
* }
|
|
* else if ( ... )
|
|
* </pre>
|
|
* <strong>Note:</strong><br>
|
|
* <p>
|
|
* ICU defines plural rules for many locales based on CLDR <i>Language Plural Rules</i>.
|
|
* For these predefined rules, see CLDR page at
|
|
* http://unicode.org/repos/cldr-tmp/trunk/diff/supplemental/language_plural_rules.html
|
|
* </p>
|
|
*/
|
|
class U_I18N_API PluralRules : public UObject {
|
|
public:
|
|
|
|
/**
|
|
* Constructor.
|
|
* @param status Output param set to success/failure code on exit, which
|
|
* must not indicate a failure before the function call.
|
|
*
|
|
* @stable ICU 4.0
|
|
*/
|
|
PluralRules(UErrorCode& status);
|
|
|
|
/**
|
|
* Copy constructor.
|
|
* @stable ICU 4.0
|
|
*/
|
|
PluralRules(const PluralRules& other);
|
|
|
|
/**
|
|
* Destructor.
|
|
* @stable ICU 4.0
|
|
*/
|
|
virtual ~PluralRules();
|
|
|
|
/**
|
|
* Clone
|
|
* @stable ICU 4.0
|
|
*/
|
|
PluralRules* clone() const;
|
|
|
|
/**
|
|
* Assignment operator.
|
|
* @stable ICU 4.0
|
|
*/
|
|
PluralRules& operator=(const PluralRules&);
|
|
|
|
/**
|
|
* Creates a PluralRules from a description if it is parsable, otherwise
|
|
* returns NULL.
|
|
*
|
|
* @param description rule description
|
|
* @param status Output param set to success/failure code on exit, which
|
|
* must not indicate a failure before the function call.
|
|
* @return new PluralRules pointer. NULL if there is an error.
|
|
* @stable ICU 4.0
|
|
*/
|
|
static PluralRules* U_EXPORT2 createRules(const UnicodeString& description,
|
|
UErrorCode& status);
|
|
|
|
/**
|
|
* The default rules that accept any number.
|
|
*
|
|
* @param status Output param set to success/failure code on exit, which
|
|
* must not indicate a failure before the function call.
|
|
* @return new PluralRules pointer. NULL if there is an error.
|
|
* @stable ICU 4.0
|
|
*/
|
|
static PluralRules* U_EXPORT2 createDefaultRules(UErrorCode& status);
|
|
|
|
/**
|
|
* Provides access to the predefined <code>PluralRules</code> for a given
|
|
* locale.
|
|
*
|
|
* @param locale The locale for which a <code>PluralRules</code> object is
|
|
* returned.
|
|
* @param status Output param set to success/failure code on exit, which
|
|
* must not indicate a failure before the function call.
|
|
* @return The predefined <code>PluralRules</code> object pointer for
|
|
* this locale. If there's no predefined rules for this locale,
|
|
* the rules for the closest parent in the locale hierarchy
|
|
* that has one will be returned. The final fallback always
|
|
* returns the default 'other' rules.
|
|
* @stable ICU 4.0
|
|
*/
|
|
static PluralRules* U_EXPORT2 forLocale(const Locale& locale, UErrorCode& status);
|
|
|
|
/**
|
|
* Given a number, returns the keyword of the first rule that applies to
|
|
* the number. This function can be used with isKeyword* functions to
|
|
* determine the keyword for default plural rules.
|
|
*
|
|
* @param number The number for which the rule has to be determined.
|
|
* @return The keyword of the selected rule.
|
|
* @stable ICU 4.0
|
|
*/
|
|
UnicodeString select(int32_t number) const;
|
|
|
|
/**
|
|
* Given a number, returns the keyword of the first rule that applies to
|
|
* the number. This function can be used with isKeyword* functions to
|
|
* determine the keyword for default plural rules.
|
|
*
|
|
* @param number The number for which the rule has to be determined.
|
|
* @return The keyword of the selected rule.
|
|
* @stable ICU 4.0
|
|
*/
|
|
UnicodeString select(double number) const;
|
|
|
|
/**
|
|
* Returns a list of all rule keywords used in this <code>PluralRules</code>
|
|
* object. The rule 'other' is always present by default.
|
|
*
|
|
* @param status Output param set to success/failure code on exit, which
|
|
* must not indicate a failure before the function call.
|
|
* @return StringEnumeration with the keywords.
|
|
* The caller must delete the object.
|
|
* @stable ICU 4.0
|
|
*/
|
|
StringEnumeration* getKeywords(UErrorCode& status) const;
|
|
|
|
#ifndef U_HIDE_DRAFT_API
|
|
/**
|
|
* Returns a unique value for this keyword if it exists, else the constant
|
|
* UPLRULES_NO_UNIQUE_VALUE.
|
|
*
|
|
* @param keyword The keyword.
|
|
* @return The unique value that generates the keyword, or
|
|
* UPLRULES_NO_UNIQUE_VALUE if the keyword is undefined or there is no
|
|
* unique value that generates this keyword.
|
|
* @draft ICU 4.8
|
|
*/
|
|
double getUniqueKeywordValue(const UnicodeString& keyword);
|
|
|
|
/**
|
|
* Returns all the values for which select() would return the keyword. If
|
|
* the keyword is unknown, returns no values, but this is not an error. If
|
|
* the number of values is unlimited, returns no values and -1 as the
|
|
* count.
|
|
*
|
|
* The number of returned values is typically small.
|
|
*
|
|
* @param keyword The keyword.
|
|
* @param dest Array into which to put the returned values. May
|
|
* be NULL if destCapacity is 0.
|
|
* @param destCapacity The capacity of the array, must be at least 0.
|
|
* @param status The error code.
|
|
* @return The count of values available, or -1. This count
|
|
* can be larger than destCapacity, but no more than
|
|
* destCapacity values will be written.
|
|
* @draft ICU 4.8
|
|
*/
|
|
int32_t getAllKeywordValues(const UnicodeString &keyword,
|
|
double *dest, int32_t destCapacity,
|
|
UErrorCode& status);
|
|
|
|
/**
|
|
* Returns sample values for which select() would return the keyword. If
|
|
* the keyword is unknown, returns no values, but this is not an error.
|
|
*
|
|
* The number of returned values is typically small.
|
|
*
|
|
* @param keyword The keyword.
|
|
* @param dest Array into which to put the returned values. May
|
|
* be NULL if destCapacity is 0.
|
|
* @param destCapacity The capacity of the array, must be at least 0.
|
|
* @param status The error code.
|
|
* @return The count of values written.
|
|
* If more than destCapacity samples are available, then
|
|
* only destCapacity are written, and destCapacity is returned as the count,
|
|
* rather than setting a U_BUFFER_OVERFLOW_ERROR.
|
|
* (The actual number of keyword values could be unlimited.)
|
|
* @draft ICU 4.8
|
|
*/
|
|
int32_t getSamples(const UnicodeString &keyword,
|
|
double *dest, int32_t destCapacity,
|
|
UErrorCode& status);
|
|
#endif /* U_HIDE_DRAFT_API */
|
|
|
|
/**
|
|
* Returns TRUE if the given keyword is defined in this
|
|
* <code>PluralRules</code> object.
|
|
*
|
|
* @param keyword the input keyword.
|
|
* @return TRUE if the input keyword is defined.
|
|
* Otherwise, return FALSE.
|
|
* @stable ICU 4.0
|
|
*/
|
|
UBool isKeyword(const UnicodeString& keyword) const;
|
|
|
|
|
|
/**
|
|
* Returns keyword for default plural form.
|
|
*
|
|
* @return keyword for default plural form.
|
|
* @stable ICU 4.0
|
|
*/
|
|
UnicodeString getKeywordOther() const;
|
|
|
|
/**
|
|
* Compares the equality of two PluralRules objects.
|
|
*
|
|
* @param other The other PluralRules object to be compared with.
|
|
* @return True if the given PluralRules is the same as this
|
|
* PluralRules; false otherwise.
|
|
* @stable ICU 4.0
|
|
*/
|
|
virtual UBool operator==(const PluralRules& other) const;
|
|
|
|
/**
|
|
* Compares the inequality of two PluralRules objects.
|
|
*
|
|
* @param other The PluralRules object to be compared with.
|
|
* @return True if the given PluralRules is not the same as this
|
|
* PluralRules; false otherwise.
|
|
* @stable ICU 4.0
|
|
*/
|
|
UBool operator!=(const PluralRules& other) const {return !operator==(other);}
|
|
|
|
|
|
/**
|
|
* ICU "poor man's RTTI", returns a UClassID for this class.
|
|
*
|
|
* @stable ICU 4.0
|
|
*
|
|
*/
|
|
static UClassID U_EXPORT2 getStaticClassID(void);
|
|
|
|
/**
|
|
* ICU "poor man's RTTI", returns a UClassID for the actual class.
|
|
*
|
|
* @stable ICU 4.0
|
|
*/
|
|
virtual UClassID getDynamicClassID() const;
|
|
|
|
|
|
private:
|
|
RuleChain *mRules;
|
|
RuleParser *mParser;
|
|
double *mSamples;
|
|
int32_t *mSampleInfo;
|
|
int32_t mSampleInfoCount;
|
|
|
|
PluralRules(); // default constructor not implemented
|
|
int32_t getRepeatLimit() const;
|
|
void parseDescription(UnicodeString& ruleData, RuleChain& rules, UErrorCode &status);
|
|
void getNextLocale(const UnicodeString& localeData, int32_t* curIndex, UnicodeString& localeName);
|
|
void addRules(RuleChain& rules);
|
|
int32_t getNumberValue(const UnicodeString& token) const;
|
|
UnicodeString getRuleFromResource(const Locale& locale, UErrorCode& status);
|
|
|
|
static const int32_t MAX_SAMPLES = 3;
|
|
|
|
int32_t getSamplesInternal(const UnicodeString &keyword, double *dest,
|
|
int32_t destCapacity, UBool includeUnlimited,
|
|
UErrorCode& status);
|
|
int32_t getKeywordIndex(const UnicodeString& keyword,
|
|
UErrorCode& status) const;
|
|
void initSamples(UErrorCode& status);
|
|
|
|
};
|
|
|
|
U_NAMESPACE_END
|
|
|
|
#endif /* #if !UCONFIG_NO_FORMATTING */
|
|
|
|
#endif // _PLURRULE
|
|
//eof
|